-48V Hot Swap Controller
LTC4253/LTC4253A –48V Hot Swap Controllers
with Sequencer
FEATURES
n Allows Safe Board Insertion and Removal from a Li...
Description
LTC4253/LTC4253A –48V Hot Swap Controllers
with Sequencer
FEATURES
n Allows Safe Board Insertion and Removal from a Live –48V Backplane
n Floating Topology Permits Very High Voltage Operation
n Adjustable Analog Current Limit with Breaker Timer Ideal for Two Battery Feeds
n Fast Response Time Limits Peak Fault Current n Adjustable Undervoltage/Overvoltage Protection
with ±1% Threshold Accuracy (LTC4253A) n Three Sequenced Power Good Outputs n Adjustable Soft-Start Current Limit n Adjustable Timer with Drain Voltage Accelerated
Response n Latchoff After Fault n Available in a 16-Pin SSOP Package
APPLICATIONS
n –48V Distributed Power Systems n Negative Power Supply Control n Central Office Switching n High Availability Servers n Disk Arrays
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
DESCRIPTION
The LTC®4253/LTC4253A negative voltage Hot Swap™ controllers allow a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current-limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault conditions. The LTC4253/LTC4253A latch off after a circuit fault. Adjustable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the des...
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